Bent steel pipe welding device and method

Abstract

The invention relates to the technical field of steel pipe welding, in particular to a bent steel pipe welding device and method.The bent steel pipe welding device comprises a workbench, a first positioning mechanism, a supporting mechanism, a mounting plate and a second positioning mechanism, an adjusting groove used for assembling the mounting plate is formed in one end of the upper end face of the workbench, and the adjusting groove is of a fan-shaped structure; the end, away from the adjusting groove, of the upper end face of the workbench is provided with a moving groove used for installing the first positioning mechanism, and the end, close to the moving groove, of the workbench is provided with a supporting mechanism used for containing a straight pipe and a bent pipe corresponding to the middle of the adjusting groove. By arranging the first positioning mechanism and the second positioning mechanism which can be adjusted in multiple directions and combining the fan-shaped adjusting groove and the rotatable mounting plate, the butt joint ends of the straight pipe and the bent pipe can be accurately adjusted to be in a preset axis alignment state, and a multi-stage and precise positioning system can be formed in cooperation with use of the supporting mechanism; the common problems of misalignment, uneven gaps and the like in the welding process can be avoided, and then the product quality is improved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe welding technology, and specifically to a bending steel pipe welding device and welding method. Background Technology

[0002] Steel pipes are used for transporting fluids and powdery solids, exchanging heat energy, manufacturing mechanical parts and containers, and are also an economical steel material. Steel pipes have a hollow cross-section, with a length much greater than their diameter or circumference. They are classified by cross-sectional shape into round, square, rectangular, and irregularly shaped steel pipes; by material into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes, and composite steel pipes; by application into pipes for transportation, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, and high-pressure equipment; by production process into seamless steel pipes and welded steel pipes, with seamless steel pipes further divided into hot-rolled and cold-rolled types, and welded steel pipes into straight-seam welded steel pipes and spiral-seam welded steel pipes; and by production method into seamless steel pipes and welded steel pipes, with welded steel pipes divided into straight-seam welded steel pipes and spiral-seam welded pipes.

[0003] When steel pipes are processed, they need to be bent to form bends according to different usage requirements. When welding bends, they usually rely on manual positioning and fixing, which has problems such as poor centering and difficulty in adjusting the welding angle, resulting in unstable welding quality and low efficiency.

[0004] Therefore, we propose a bending steel pipe welding device and welding method. Summary of the Invention

[0005] The main objective of this invention is to provide a welding device and method for bending steel pipes. By setting up a first and second positioning mechanism that can be adjusted in multiple directions, and combining a fan-shaped adjustment groove and a rotatable mounting plate, the joint ends of the straight pipe and the bent pipe can be precisely adjusted to a preset axial alignment state. The first limiting rod, the second limiting rod, the first limiting plate, and the second limiting plate that can be flexibly assembled on the support mechanism further ensure the precise positioning and stable clamping of the pipe fittings in the support position. Through the above structural combination, a multi-level, precise positioning system can be formed, which can avoid common problems such as misalignment and uneven gaps during the welding process, and improve the quality of the product. It can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A bending steel pipe welding device includes a worktable, a first positioning mechanism, a support mechanism, a mounting plate, and a second positioning mechanism. The worktable is a horizontally arranged rectangular plate structure. One end of the upper surface of the worktable is provided with an adjustment groove for assembling the mounting plate. The adjustment groove is a fan-shaped structure. The end of the upper surface of the worktable away from the adjustment groove is provided with a moving groove for installing the first positioning mechanism. The end of the worktable away from the adjustment groove, below the moving groove, is also provided with an installation channel for installing a threaded rod. The end of the worktable near the moving groove, corresponding to the center of the adjustment groove, is provided with a support mechanism for placing straight pipes and bent pipes. The upper surface of the mounting plate is equipped with two sets of relatively parallel second positioning mechanisms. The second positioning mechanism has a limiting cavity for the straight pipe to pass through. The end of the bent pipe away from the support mechanism is inserted into the first positioning mechanism, and the end of the straight pipe away from the support mechanism is inserted into the second positioning mechanism located on the mounting plate.

[0008] The adjustment slot is rotatably connected to a mounting plate via a pivot at the center of one end near the support mechanism. A sliding column is inserted into the end of the mounting plate away from the pivot. The mounting plate is fixedly connected to the worktable via locking bolts. The support mechanism includes a first limiting rod, a second limiting rod, a first support plate, a second support plate, a third support plate, a first limiting plate, a second limiting plate, and an anti-slip pad.

[0009] By adopting the above technical solution, and by setting up a first and second positioning mechanism that can be adjusted in multiple directions, combined with a fan-shaped adjustment groove and a rotatable mounting plate, the connecting ends of straight pipes and bent pipes can be precisely adjusted to a preset axial alignment state. The first and second limiting rods, as well as the first and second limiting plates that can be flexibly assembled on the support mechanism, ensure the precise positioning and stable clamping of the pipe fittings in the support position. Through the above structural cooperation, a multi-level, precise positioning system can be formed, which can avoid common problems such as misalignment and uneven gaps during welding, and improve product quality.

[0010] Specifically, the second support plate is fixedly connected to the first support plate at one end, and the second support plate is fixedly connected to the third support plate at the vertically adjacent end. The first support plate and the third support plate are arranged at a right angle. The first support plate, the second support plate and the third support plate together form a horizontally placed L-shaped structure. The first support plate is located between the second support plate and the first positioning mechanism, and the third support plate is located between the second support plate and the adjustment groove.

[0011] Specifically, the inner wall of the bottom of the adjustment groove is provided with an arc-shaped slide for the sliding column to slide at the end away from the rotating shaft. The bottom end of the sliding column passes vertically through the mounting plate and is located in the arc-shaped slide. The sliding column is slidably connected to the worktable. The mounting plate rotates around the center of the rotating shaft.

[0012] Specifically, the first positioning mechanism includes a first support platform, a first fastener, a moving block, a slide bar, and a first positioning post. The upper surface of the first support platform is provided with a first arc-shaped groove for placing a bent pipe at the center. The four corners of the upper surface of the first support platform are vertically inserted with first positioning posts for defining the position of the first fastener. The first fastener is located directly above the first support platform. The first positioning posts are slidably connected to each other. The two sides of the first fastener are connected to the two sides of the upper surface of the first support platform by first bolts.

[0013] Specifically, a movable block is fixedly connected at the center of the bottom of the first support platform, directly below the first arc-shaped groove. The bottom of the movable block passes through the movable groove, is inserted into the installation channel, and is fitted onto the threaded rod. Sliding grooves are provided on both sides of the installation channel. Sliding strips are fixedly connected on both sides of the movable block at the location of the sliding grooves. The sliding strips are located in the sliding grooves. The bottom of the first support platform is slidably connected to the upper surface of the worktable.

[0014] Specifically, the upper surface of the workbench near the moving slot is also fitted with a mounting box for installing a motor. The mounting box is located at one end of the installation channel. The motor is fixedly assembled inside the mounting box. One end of the threaded rod is rotatably connected to the inner wall of one end of the installation channel. The other end of the threaded rod passes through one end of the mounting box and is connected to the output shaft of one end of the motor. The top of the mounting box is provided with a slot for installing a mounting plate.

[0015] Specifically, the upper surfaces of the first, second, and third support plates are all glued with L-shaped anti-slip pads. The third support plate has multiple sets of first threaded holes for installing second limiting rods at equal intervals on both sides of the end away from the second support plate. A second limiting plate is installed on the top ends of the two second limiting rods. The upper surface of the second support plate away from the first support plate and at one end of the second support plate has a second threaded hole for installing the first limiting rod. The upper surface of the second support plate away from the second threaded hole has a third threaded hole for installing the third limiting rod. The top ends of the first and third limiting rods are connected to the first limiting plate. A first channel for the bending section of the bend to pass through is provided between the first and third limiting rods.

[0016] By adopting the above technical solution, the first and second limiting rods in the support mechanism allow for flexible configuration of different mounting hole positions based on pipe diameter and bending angle. The first positioning mechanism can achieve linear position adjustment via a motor-driven threaded rod to adapt to bends of different lengths. The angle of the mounting plate where the second positioning mechanism is located can be flexibly adjusted to match different bending angles of the bends, thereby improving the applicability of the device. The axial positioning of one end of the bend can be completed by motor drive, and the angle positioning of the straight end can be manually adjusted by loosening the locking bolts, which has the advantage of simple operation. At the same time, the support mechanism can effectively support and limit the bending section of the pipe, reducing the labor intensity of workers and shortening the total time for workpiece clamping, centering, and welding, thereby improving production efficiency.

[0017] Specifically, the second positioning mechanism includes a second support platform, a second fastener, a second positioning post, a protective pad, and a second bolt. The upper surface of the second support platform has four vertically inserted second positioning posts for installing the second fasteners. The second fasteners are slidably connected to the second positioning posts. The second fasteners are located directly above the second support platform and are fixedly connected to it by the second bolt. A second arc-shaped groove is provided in the center of the upper surface of the second support platform, and a protective pad is glued to the inner wall of the second arc-shaped groove. A support block for supporting the straight pipe is fixedly connected to the upper surface of the mounting plate near the pivot.

[0018] A welding method for a bending steel pipe welding device includes the following steps:

[0019] S1. Check whether the workbench, the first positioning mechanism, the support mechanism and the second positioning mechanism are intact. Then, assemble the support mechanism according to the size of the straight pipe and the bent pipe and the welding requirements. Install two relatively parallel first limit rods at the second threaded hole on the upper surface of the second support plate away from the first support plate and at the second threaded hole at one end of the second support plate. Install a third limit rod at the third threaded hole on the upper surface of the second support plate away from the second threaded hole. A first channel for the bent section of the bent pipe to pass through is provided between the first limit rod and the third limit rod.

[0020] The bent section of the pipe is placed on the anti-slip pad of the support mechanism. The bent section of the pipe passes through the first channel. The tops of the first limit rod and the third limit rod are connected to the first limit plate. The motor drives the threaded rod to rotate, which drives the moving block to move along the moving groove to adjust the position of the first support platform. The other end of the pipe is inserted into the first arc-shaped groove of the first positioning mechanism. The pipe is fixed to the first support platform by the first fastener and the first bolt.

[0021] S2. Adjust the angle of the mounting plate according to the bending angle of the bend, loosen the locking bolts, push the mounting plate to rotate around the pivot, and slide it in the arc-shaped slide through the sliding column to align the second positioning mechanism on the mounting plate with the axis of the bend. After the adjustment is completed, tighten the locking bolts to fix the mounting plate.

[0022] At the same time, according to the bending angle of the bend, two opposing second limiting rods are installed at the first threaded holes on both sides of the end of the third support plate away from the second support plate, and a second channel for the straight pipe to pass through is provided between the two opposing second limiting rods.

[0023] S3. Then, one end of the straight tube passes through the limiting cavity of the second positioning mechanism, and one end is located on the anti-slip pad on the upper surface of the third support plate. One end of the straight tube also passes through the second channel. The two second limiting rods are connected to the second limiting plate. The straight tube is fixed to the second support platform by the second fastener and the second bolt to ensure that one end of the straight tube and the end of the bent tube are aligned at the support mechanism.

[0024] S4. Use a welding torch to weld the joint between the straight pipe and the bend, using a segmented welding method. If multi-angle welding is required, loosen the locking bolts, fine-tune the angle of the mounting plate, and then re-fix it. After welding, loosen the first and second positioning mechanisms, remove the weldment, clean the welding slag, check the weld quality, and repair or grind any defects.

[0025] The beneficial effects of this invention are:

[0026] (1) The bending steel pipe welding device and welding method of the present invention, by setting up a first positioning mechanism and a second positioning mechanism that can be adjusted in multiple directions, and combined with a fan-shaped adjustment groove and a rotatable mounting plate, can accurately adjust the docking end of the straight pipe and the bent pipe to a preset axial alignment state. The first limiting rod, the second limiting rod, the first limiting plate, and the second limiting plate that can be flexibly assembled on the support mechanism further ensure the accurate positioning and stable clamping of the pipe in the support position. Through the above structural cooperation, a multi-level and precise positioning system can be formed, which can avoid common problems such as misalignment and uneven gaps in the welding process and improve the quality of the product.

[0027] (2) The bending steel pipe welding device and welding method of the present invention, through the setting of the first limiting rod and the second limiting rod in the support mechanism, can be flexibly configured according to the pipe diameter and bending angle by selecting different mounting hole positions; the first positioning mechanism can realize the linear adjustment of position by driving the threaded rod with a motor to adapt to bending pipes of different lengths; the angle of the mounting plate where the second positioning mechanism is located can be flexibly adjusted to match different bending angles of the bending pipes; thereby improving the applicability of the device; the axial positioning of one end of the bending pipe can be completed by driving the motor, and the angle positioning of one end of the straight pipe can be manually adjusted by loosening the locking bolt, which has the advantage of simple operation. At the same time, the support mechanism can effectively support and limit the bending section of the pipe, which can reduce the labor intensity of workers, and also shorten the total time of workpiece clamping, centering and welding, thereby improving production efficiency;

[0028] (3) The bending steel pipe welding device and welding method of the present invention adopts the clamping method of support platform and fastener with positioning column, which is firmly locked and effectively prevents the pipe from shifting or loosening due to thermal stress or external force during the welding process. The L-shaped structure at the bottom of the support mechanism and the anti-slip pad on it increase the friction and stability of the pipe placement. In addition, the limiting plate at the top of each limiting rod constitutes effective protection to prevent the pipe from rolling down accidentally during operation and improves the safety of the welding operation process. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 This is a perspective view of the present invention;

[0033] Figure 4 This is a perspective view of the second positioning mechanism of the present invention;

[0034] Figure 5 This is a perspective view of the mounting plate of the present invention;

[0035] Figure 6 This is a perspective view of the second support plate of the present invention;

[0036] Figure 7 This is a perspective view of the first positioning mechanism of the present invention;

[0037] In the diagram: 1. Workbench; 2. First positioning mechanism; 201. First support platform; 202. First fastener; 203. Moving block; 204. Sliding bar; 205. First arc groove; 206. First positioning post; 3. Support mechanism; 301. First limiting rod; 302. Second limiting rod; 303. First support plate; 304. Second support plate; 305. Third support plate; 306. First threaded hole; 307. First limiting plate; 308. Second limiting plate; 309. Anti-slip pad 4. Mounting box; 401. Slot; 402. Plate; 5. Adjustment slot; 6. Arc-shaped slide; 7. Second positioning mechanism; 701. Second support platform; 702. Second fastener; 703. Second positioning post; 704. Protective pad; 705. Second bolt; 8. Straight pipe; 9. Bend; 10. Mounting plate; 11. Rotating shaft; 12. Mounting channel; 13. Sliding column; 14. Support block; 15. Locking bolt; 16. Motor; 17. Threaded rod; 18. Moving slot; 19. Slide. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] As one embodiment of the present invention, such as Figures 1-7 As shown, the present invention discloses a bending steel pipe welding device, comprising a workbench 1, a first positioning mechanism 2, a support mechanism 3, a mounting plate 10, and a second positioning mechanism 7. The workbench 1 is a horizontally arranged rectangular plate structure. One end of the upper surface of the workbench 1 is provided with an adjustment groove 5 for assembling the mounting plate 10. The adjustment groove 5 is a fan-shaped structure. The upper surface of the workbench 1 away from the adjustment groove 5 is provided with a moving groove 18 for installing the first positioning mechanism 2. The lower part of the workbench 1 away from the adjustment groove 5 and below the moving groove 18 is also provided with an installation channel 12 for installing a threaded rod 17. The support mechanism 3 for placing a straight pipe 8 and a bent pipe 9 is provided at the center of the adjustment groove 5 at the end of the workbench 1 near the moving groove 18. Two sets of relatively parallel second positioning mechanisms 7 are installed on the upper surface of the mounting plate 10. The second positioning mechanism 7 is provided with a limiting cavity for the straight pipe 8 to pass through. The bent pipe 9 is inserted into the first positioning mechanism 2 at the end away from the support mechanism 3, and the straight pipe 8 is inserted into the second positioning mechanism 7 located on the mounting plate 10 at the end away from the support mechanism 3.

[0040] The adjustment groove 5 is rotatably connected to the mounting plate 10 at the center of the end near the support mechanism 3 via a rotating shaft 11. The mounting plate 10 is inserted into the end away from the rotating shaft 11 with a sliding column 13. The mounting plate 10 is fixedly connected to the workbench 1 by locking bolts 15. The support mechanism 3 includes a first limiting rod 301, a second limiting rod 302, a first support plate 303, a second support plate 304, a third support plate 305, a first limiting plate 307, a second limiting plate 308, and an anti-slip pad 309.

[0041] When in use, use a welding torch to weld the joint between the straight pipe 8 and the bent pipe 9. The segmented welding method can be used. If multi-angle welding is required, loosen the locking bolt 15, fine-tune the angle of the mounting plate 10, and then fix it again. After welding, loosen the first positioning mechanism 2 and the second positioning mechanism 7, remove the welded parts, clean the welding slag, check the weld quality, and repair or grind any defects.

[0042] The present invention further includes a first support plate 303 fixedly connected to one end of the second support plate 304, and a third support plate 305 fixedly connected to the vertically adjacent end of the second support plate 304. The first support plate 303 and the third support plate 305 are arranged at right angles. The first support plate 303, the second support plate 304 and the third support plate 305 together form a horizontally placed L-shaped structure. The first support plate 303 is located between the second support plate 304 and the first positioning mechanism 2, and the third support plate 305 is located between the second support plate 304 and the adjustment groove 5.

[0043] The present invention also includes an arc-shaped slide 6 provided at the end of the inner wall of the bottom of the adjustment groove 5 away from the rotating shaft 11 for sliding column 13. The bottom end of the slide column 13 passes vertically through the mounting plate 10 and is located in the arc-shaped slide 6. The slide column 13 is slidably connected to the worktable 1. The mounting plate 10 rotates about the center of the rotating shaft 11.

[0044] The present invention further includes the first positioning mechanism 2 comprising a first support platform 201, a first fastener 202, a moving block 203, a slide bar 204, and a first positioning post 206. The upper end face of the first support platform 201 is provided with a first arc-shaped groove 205 for placing the bent pipe 9 at the center. The four corners of the upper end face of the first support platform 201 are each vertically inserted with a first positioning post 206 for defining the position of the first fastener 202. The first fastener 202 is located directly above the first support platform 201. The first positioning post 206 is slidably connected to the first positioning post 206. The two sides of the first fastener 202 are connected to the two sides of the upper end face of the first support platform 201 by first bolts.

[0045] The invention also includes a movable block 203 fixedly connected at the center of the bottom of the first support platform 201, directly below the first arc-shaped groove 205. The bottom of the movable block 203 passes through the movable groove 18, is inserted into the installation channel 12, and is sleeved on the threaded rod 17. Sliding grooves 19 are provided on both sides of the installation channel 12. Sliding strips 204 are fixedly connected on both sides of the movable block 203 at the location of the sliding grooves 19. The sliding strips 204 are located in the sliding grooves 19. The bottom of the first support platform 201 is slidably connected to the upper surface of the workbench 1.

[0046] The present invention also includes a mounting box 4 for mounting a motor 16, which is embedded in the upper end of the workbench 1 near the moving groove 18. The mounting box 4 is located at one end of the mounting channel 12. The motor 16 is fixedly mounted inside the mounting box 4. One end of the threaded rod 17 is rotatably connected to the inner wall of one end of the mounting channel 12. The other end of the threaded rod 17 passes through one end of the mounting box 4 and is connected to the output shaft of one end of the motor 16. The top of the mounting box 4 is provided with a slot 401 for mounting a card plate 402.

[0047] The present invention further includes an L-shaped anti-slip pad 309 glued to the upper surfaces of the first support plate 303, the second support plate 304, and the third support plate 305. Multiple sets of first threaded holes 306 for installing the second limiting rod 302 are equidistantly provided on both sides of the third support plate 305 away from the second support plate 304. A second limiting plate 308 is installed on the top ends of the two second limiting rods 302. A second threaded hole for installing the first limiting rod 301 is provided on the upper surface of the second support plate 304 away from the first support plate 303 and the second support plate 304. A third threaded hole for installing the third limiting rod is provided on the upper surface of the second support plate 304 away from the second threaded hole. The top ends of the first limiting rod 301 and the third limiting rod are connected to a first limiting plate 307. A first channel for the bending section of the bend 9 to pass through is provided between the first limiting rod 301 and the third limiting rod.

[0048] The present invention further includes that the second positioning mechanism 7 includes a second support platform 701, a second fastener 702, a second positioning post 703, a protective pad 704, and a second bolt 705. The second positioning post 703 for installing the second fastener 702 is vertically inserted at each of the four corners of the upper end face of the second support platform 701. The second fastener 702 is slidably connected to the second positioning post 703. The second fastener 702 is located directly above the second support platform 701 and is fixedly connected to it by the second bolt 705. A second arc-shaped groove is provided at the center of the upper end face of the second support platform 701. The protective pad 704 is fixedly glued to the inner wall of the second arc-shaped groove. A support block 14 for supporting the straight pipe 8 is fixedly connected to the upper end face of the mounting plate 10 near the rotating shaft 11.

[0049] A welding method for a bending steel pipe welding device includes the following steps:

[0050] S1. Check whether the workbench 1, the first positioning mechanism 2, the support mechanism 3 and the second positioning mechanism 7 are intact. Then, according to the size of the straight pipe 8 and the bent pipe 9 and the welding requirements, assemble the support mechanism 3. Install two relatively parallel first limiting rods 301 at the second threaded hole on the upper end face of the second support plate 304 away from the first support plate 303 and the second support plate 304. Install a third limiting rod at the third threaded hole on the upper end face of the second support plate 304 away from the second threaded hole. A first channel for the bent section of the bent pipe 9 to pass through is provided between the first limiting rod 301 and the third limiting rod.

[0051] The bent section of the bend 9 is placed on the anti-slip pad 309 of the support mechanism 3. The bent section of the bend 9 passes through the first channel. The top of the first limiting rod 301 and the third limiting rod are connected to the first limiting plate 307. The motor 16 drives the threaded rod 17 to rotate, which drives the moving block 203 to move along the moving groove 18 to adjust the position of the first support platform 201. The other end of the bend 9 is inserted into the first arc groove 205 of the first positioning mechanism 2. The bend 9 is fixed on the first support platform 201 by the first fastener 202 and the first bolt.

[0052] S2. Adjust the angle of the mounting plate 10 according to the bending angle of the bend 9, loosen the locking bolt 15, push the mounting plate 10 to rotate around the rotating shaft 11, and slide it in the arc-shaped slide 6 through the sliding column 13, so that the second positioning mechanism 7 on the mounting plate 10 is aligned with the axis of the bend 9. After the adjustment is completed, tighten the locking bolt 15 to fix the mounting plate 10.

[0053] At the same time, according to the bending angle of the bend 9, two opposing second limiting rods 302 are installed at the first threaded holes 306 on both sides of the end of the third support plate 305 away from the second support plate 304, and a second channel for the straight pipe 8 to pass through is provided between the two opposing second limiting rods 302.

[0054] S3. Then, one end of the straight pipe 8 passes through the limiting cavity of the second positioning mechanism 7, and the other end is located on the anti-slip pad 309 on the upper surface of the third support plate 305. One end of the straight pipe 8 also passes through the second channel. The two second limiting rods 302 are connected to the second limiting plate 308. The straight pipe 8 is fixed to the second support platform 701 by the second fastener 702 and the second bolt 705 to ensure that one end of the straight pipe 8 and the end of the bent pipe 9 are aligned at the support mechanism 3.

[0055] S4. Use a welding torch to weld the joint between the straight pipe 8 and the bend 9, using a segmented welding method. If multi-angle welding is required, loosen the locking bolt 15, fine-tune the angle of the mounting plate 10, and then re-fix it. After welding, loosen the first positioning mechanism 2 and the second positioning mechanism 7, remove the welded parts, clean the welding slag, check the weld quality, and repair or grind any defects.

[0056] In this bending steel pipe welding device and welding method, the support mechanism 3 is first assembled according to the size of the straight pipe 8, the bent pipe 9 and the welding requirements. Two parallel first limiting rods 301 are installed at the second threaded hole on the upper end face of the second support plate 304 away from the first support plate 303 and the second support plate 304. A third limiting rod is installed at the third threaded hole on the upper end face of the second support plate 304 away from the second threaded hole. A first channel for the bent section of the bent pipe 9 to pass through is provided between the first limiting rod 301 and the third limiting rod.

[0057] Then, the bent section of the bend 9 is placed on the anti-slip pad 309 of the support mechanism 3. The bent section of the bend 9 passes through the first channel. The tops of the first limiting rod 301 and the third limiting rod are connected to the first limiting plate 307. The motor 16 drives the threaded rod 17 to rotate, causing the moving block 203 to move along the moving groove 18. The position of the first support platform 201 is adjusted. The other end of the bend 9 is inserted into the first arc-shaped groove 205 of the first positioning mechanism 2. The bend 9 is fixed to the first support platform 201 by the first fastener 202 and the first bolt. According to the bending angle of the bend 9, the angle of the mounting plate 10 is adjusted. The locking bolt 15 is loosened, and the mounting plate 10 is pushed to rotate around the rotating shaft 11. It slides in the arc-shaped slide 6 through the sliding column 13, so that the second positioning mechanism 7 on the mounting plate 10 is aligned with the axis of the bend 9. After completion, tighten the locking bolts 15 to fix the mounting plate 10; at the same time, according to the bending angle of the bend 9, install two opposing second limiting rods 302 at the first threaded holes 306 on both sides of the end of the third support plate 305 away from the second support plate 304, and provide a second channel for the straight pipe 8 to pass through between the two opposing second limiting rods 302; then pass one end of the straight pipe 8 through the limiting cavity of the second positioning mechanism 7, and place one end on the anti-slip pad 309 on the upper surface of the third support plate 305. One end of the straight pipe 8 also passes through the second channel. The top ends of the two opposing second limiting rods 302 are connected to the second limiting plate 308. The straight pipe 8 is fixed to the second support platform 701 by the second fastener 702 and the second bolt 705 to ensure that one end of the straight pipe 8 and the end of the bend 9 are aligned at the support mechanism 3;

[0058] Finally, use a welding torch to weld the joint between the straight pipe 8 and the bent pipe 9. A segmented welding method can be used. If multi-angle welding is required, loosen the locking bolt 15, fine-tune the angle of the mounting plate 10, and then re-fix it. After welding, loosen the first positioning mechanism 2 and the second positioning mechanism 7, remove the welded parts, clean the welding slag, check the weld quality, and repair or grind any defects.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bending steel pipe welding device, characterized in that, The system includes a worktable (1), a first positioning mechanism (2), a support mechanism (3), a mounting plate (10), and a second positioning mechanism (7). The worktable (1) is a horizontally arranged rectangular plate structure. One end of the upper surface of the worktable (1) is provided with an adjustment groove (5) for assembling the mounting plate (10). The adjustment groove (5) is a fan-shaped structure. The upper surface of the worktable (1) away from the adjustment groove (5) is provided with a moving groove (18) for installing the first positioning mechanism (2). The lower part of the worktable (1) away from the adjustment groove (5) and below the moving groove (18) is also provided with a threaded rod (10). 7) Installation channel (12), the workbench (1) is provided with a support mechanism (3) for placing straight pipe (8) and bent pipe (9) at the center of the adjustment slot (5) near the moving slot (18). The upper surface of the mounting plate (10) is provided with two sets of relatively parallel second positioning mechanisms (7). The second positioning mechanism (7) is provided with a limiting cavity for the straight pipe (8) to pass through. The bent pipe (9) is inserted into the first positioning mechanism (2) at the end away from the support mechanism (3). The straight pipe (8) is inserted into the second positioning mechanism (7) located on the mounting plate (10). The adjustment groove (5) is rotatably connected to the mounting plate (10) at the center of the end near the support mechanism (3) via a rotating shaft (11). The mounting plate (10) is connected to a sliding column (13) at the end away from the rotating shaft (11). The mounting plate (10) is fixedly connected to the workbench (1) by locking bolts (15). The support mechanism (3) includes a first limiting rod (301), a second limiting rod (302), a first support plate (303), a second support plate (304), a third support plate (305), a first limiting plate (307), a second limiting plate (308), and an anti-slip pad (309).

2. The bending steel pipe welding device according to claim 1, characterized in that, The second support plate (304) is fixedly connected to the first support plate (303) at one end, and the second support plate (304) is fixedly connected to the third support plate (305) at one end perpendicularly adjacent to it. The first support plate (303) and the third support plate (305) are arranged at right angles. The first support plate (303), the second support plate (304) and the third support plate (305) together form a horizontally placed L-shaped structure. The first support plate (303) is located between the second support plate (304) and the first positioning mechanism (2), and the third support plate (305) is located between the second support plate (304) and the adjustment groove (5).

3. The bending steel pipe welding device according to claim 2, characterized in that, The inner wall of the bottom end of the adjustment groove (5) is provided with an arc-shaped slide (6) for sliding column (13) to slide at the end away from the rotating shaft (11). The bottom end of the slide column (13) passes vertically through the mounting plate (10) and is located in the arc-shaped slide (6). The slide column (13) is slidably connected to the worktable (1). The mounting plate (10) rotates around the center of the rotating shaft (11).

4. The bending steel pipe welding device according to claim 1, characterized in that, The first positioning mechanism (2) includes a first support platform (201), a first fastener (202), a moving block (203), a slide bar (204), and a first positioning post (206). The upper surface of the first support platform (201) is provided with a first arc-shaped groove (205) for placing a bent pipe (9) at the center. The four corners of the upper surface of the first support platform (201) are vertically inserted with first positioning posts (206) for limiting the position of the first fastener (202). The first fastener (202) is located directly above the first support platform (201). The first positioning post (206) is slidably connected to the first positioning post (206). The two sides of the first fastener (202) are connected to the two sides of the upper surface of the first support platform (201) by first bolts.

5. The bending steel pipe welding device according to claim 4, characterized in that, A movable block (203) is fixedly connected at the center of the bottom of the first support platform (201) directly below the first arc groove (205). The bottom of the movable block (203) passes through the movable groove (18), is inserted into the installation channel (12), and is sleeved on the threaded rod (17). Slide grooves (19) are provided on both sides of the installation channel (12). Slide strips (204) are fixedly connected on both sides of the movable block (203) at the location of the slide grooves (19). The slide strips (204) are located in the slide grooves (19). The bottom of the first support platform (201) is slidably connected to the upper surface of the workbench (1).

6. The bending steel pipe welding device according to claim 5, characterized in that, The upper surface of the workbench (1) near the moving slot (18) is also inlaid with a mounting box (4) for installing a motor (16). The mounting box (4) is located at one end of the mounting channel (12). The motor (16) is fixedly assembled inside the mounting box (4). One end of the threaded rod (17) is rotatably connected to the inner wall of one end of the mounting channel (12). The other end of the threaded rod (17) passes through one end of the mounting box (4) and is connected to the output shaft of one end of the motor (16). The top of the mounting box (4) is provided with a slot (401) for installing a mounting plate (402).

7. The bending steel pipe welding device according to claim 1, characterized in that, The upper surfaces of the first support plate (303), the second support plate (304) and the third support plate (305) are jointly glued with an L-shaped anti-slip pad (309). The third support plate (305) has multiple sets of first threaded holes (306) for installing the second limit rod (302) at equal intervals on both sides of the end away from the second support plate (304). The top ends of the two second limit rods (302) are jointly installed with a second limit plate (308). The upper surface of the second support plate (304) is provided with a second threaded hole for installing the first limit rod (301) at the end away from the first support plate (303) and the second support plate (304). The upper surface of the second support plate (304) is provided with a third threaded hole for installing the third limit rod at the end away from the second threaded hole. The top ends of the first limit rod (301) and the third limit rod are jointly connected with a first limit plate (307). A first channel for the bent section of the bend (9) to pass through is provided between the first limit rod (301) and the third limit rod.

8. The bending steel pipe welding device according to claim 1, characterized in that, The second positioning mechanism (7) includes a second support platform (701), a second fastener (702), a second positioning post (703), a protective pad (704), and a second bolt (705). The second support platform (701) has a second positioning post (703) for installing the second fastener (702) vertically inserted at the four corners of the upper end face. The second fastener (702) is slidably connected to the second positioning post (703). The second fastener (702) is located directly above the second support platform (701) and is fixedly connected to it by the second bolt (705). The upper end face of the second support platform (701) is provided with a second arc-shaped groove in the center. The inner wall of the second arc-shaped groove is fixedly glued with a protective pad (704). The upper end face of the mounting plate (10) near the rotating shaft (11) is fixedly connected with a support block (14) for supporting the straight pipe (8).

9. A welding method for a bending steel pipe welding device according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Check whether the workbench (1), the first positioning mechanism (2), the support mechanism (3) and the second positioning mechanism (7) are intact. Then, according to the size of the straight pipe (8) and the bent pipe (9) and the welding requirements, assemble the support mechanism (3). Install two parallel first limit rods (301) at the second threaded hole on the upper end face of the second support plate (304) away from the first support plate (303) and the second support plate (304). Install a third limit rod at the third threaded hole on the upper end face of the second support plate (304) away from the second threaded hole. A first channel for the bent section of the bent pipe (9) to pass through is provided between the first limit rod (301) and the third limit rod. The bent section of the bend (9) is placed on the anti-slip pad (309) of the support mechanism (3). The bent section of the bend (9) passes through the first channel. The first limiting rod (301) and the third limiting rod are connected to the first limiting plate (307). The motor (16) drives the threaded rod (17) to rotate, which drives the moving block (203) to move along the moving groove (18) to adjust the position of the first support platform (201). The other end of the bend (9) is inserted into the first arc groove (205) of the first positioning mechanism (2). The bend (9) is fixed on the first support platform (201) by the first fastener (202) and the first bolt. S2. According to the bending angle of the bend (9), adjust the angle of the mounting plate (10), loosen the locking bolt (15), push the mounting plate (10) to rotate around the rotating shaft (11), slide in the arc-shaped slide (6) through the sliding column (13), so that the second positioning mechanism (7) on the mounting plate (10) is aligned with the axis of the bend (9). After the adjustment is completed, tighten the locking bolt (15) to fix the mounting plate (10). At the same time, according to the bending angle of the bend (9), two opposing second limiting rods (302) are installed at the first threaded holes (306) on both sides of the end of the third support plate (305) away from the second support plate (304), and a second channel for the straight pipe (8) to pass through is provided between the two opposing second limiting rods (302). S3. Then, one end of the straight tube (8) passes through the limiting cavity of the second positioning mechanism (7), and the other end is located on the anti-slip pad (309) on the upper surface of the third support plate (305). One end of the straight tube (8) also passes through the second channel. The two second limiting rods (302) are connected to the second limiting plate (308). The straight tube (8) is fixed on the second support platform (701) by the second fastener (702) and the second bolt (705) to ensure that one end of the straight tube (8) and the end of the bent tube (9) are aligned at the support mechanism (3). S4. Use a welding torch to weld the joint between the straight pipe (8) and the bent pipe (9) using a segmented welding method. If multi-angle welding is required, loosen the locking bolt (15), finely adjust the angle of the mounting plate (10), and then re-fix it. After welding, loosen the first positioning mechanism (2) and the second positioning mechanism (7), remove the weldment, clean the welding slag, check the weld quality, and repair or grind the defective areas.

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